Automatic uncovering dust-free automatic weighing device

Abstract

The invention relates to an automatic uncovering dust-free automatic weighing device, and relates to the technical field of weighing devices. The device comprises a working frame, a weighing assembly is arranged on the working frame, a material barrel is arranged on the weighing assembly, the weighing assembly is used for measuring the weight of the material barrel, the top of the material barrel is open, a barrel cover used for blocking the opening of the material barrel is arranged at the opening of the material barrel, a material storage barrel is arranged on the working frame and located over the material barrel, and the bottom of the material storage barrel is open. A bottom opening of the storage barrel is aligned to a top opening of the material barrel, a valve used for controlling the bottom opening of the storage box to be opened or closed is arranged at the bottom of the storage barrel, and an uncovering assembly is arranged on the working frame, connected with the barrel cover and used for driving the barrel cover to move in the direction close to or away from the material barrel. The device has the effects that in the weighing process, the material barrel can be automatically uncovered and fed, and the working efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of weighing devices, and in particular to an automatic dust-free weighing device with automatic cover opening. Background Art

[0002] At present, when weighing materials, the material barrel is usually placed on a scale for weighing. However, in order to make the material in the material barrel reach a specified weight, a material adding operation is required.

[0003] The existing weighing equipment cannot realize the automatic opening and filling of the material barrel, and still requires manual assistance, which affects the work efficiency, so it needs to be improved. Summary of the invention In order to improve the problem that the material barrel cannot be automatically opened and added, resulting in low work efficiency, the present application provides an automatic opening and dust-free automatic weighing device.

[0004] The automatic opening dust-free automatic weighing device provided in this application adopts the following technical solution: An automatic dust-free weighing device with automatic opening comprises a working frame, on which a weighing assembly is provided, on which a material barrel is placed, the weighing assembly is used to measure the weight of the material barrel, the top of the material barrel is open, and a barrel cover for sealing the opening of the material barrel is provided at the opening of the material barrel, a material storage barrel is provided on the working frame, the material storage barrel is located directly above the material barrel, the bottom of the material storage barrel is open, the bottom opening of the material storage barrel is aligned with the top opening of the material barrel, a valve for controlling the opening or closing of the bottom opening of the material storage box is provided at the bottom of the material storage barrel, an opening assembly is provided on the working frame, the opening assembly is connected to the barrel cover, and the opening assembly is used to drive the barrel cover to move toward or away from the material barrel.

[0005] By adopting the above technical solution, when in use, the material barrel is placed on the weighing assembly, at this time the material barrel is empty, then the lid opening assembly is moved to the barrel cover, and the lid opening assembly is used to connect with the barrel cover, and then the lid opening assembly drives the barrel cover to separate from the material barrel, so that the top opening of the material barrel is in an open state, and the weighing assembly is reset to zero for preparation. Then open the valve to allow the material in the storage barrel to automatically fall into the material barrel. During this process, observe the reading on the weighing assembly. When the weight of the material barrel reaches the set value, close the valve to stop the material discharge. Then use the lid opening assembly to drive the barrel cover to reset and block the top opening of the material barrel. During the whole process, the material barrel is automatically opened and the material is automatically added, thereby improving work efficiency.

[0006] Optionally, the lid opening assembly includes a support rod, a rotating rod and a connecting piece, the support rod is vertically arranged, and the bottom end of the support rod is fixed on the work frame, the rotating rod is horizontally arranged, and one end of the rotating rod is hinged on the support rod, the connecting piece is arranged on the rotating rod, and the connecting piece is connected to the barrel cover.

[0007] By adopting the above technical solution, the rotating rod is driven so that it rotates on the support rod with the support rod as the axis until the rotating rod rotates to the barrel cover. The connecting piece is started to fix the rotating rod and the barrel cover. The rotating rod is driven to rotate again to drive the barrel cover to move out of the material barrel, so that the material barrel is in an open state.

[0008] Optionally, the connecting part includes a connecting cylinder, a suction cup, a straw, an air vent and an air port, the connecting cylinder is arranged on the rotating rod, the output end of the connecting cylinder is connected to the suction cup, the suction cup abuts against the barrel cover, the straw is arranged on the rotating rod, one end of the straw is connected to the suction cup, and the other end is connected to the air port, and the air vent is arranged on the straw.

[0009] By adopting the above technical solution, when the rotating rod moves to the barrel cover, the connecting cylinder is started to drive the suction cup to abut against the barrel cover, and then the air vent is closed, the true air port is opened, and the suction tube is evacuated to a vacuum, so that the barrel cover is sucked tightly onto the suction cup, and then the connecting cylinder is started again to drive the suction cup to move upward, so that the barrel cover is separated from the material barrel, and then the rotating rod is driven to rotate, so that the barrel cover is completely moved out of the upper area of ​​the material barrel, so that the bottom of the storage barrel is connected with the top of the material barrel, so that the material barrel can receive the material in the storage barrel.

[0010] Optionally, a mounting frame is provided on the material storage barrel, and a lifting cylinder is provided on the mounting frame. A mounting plate is fixed to the output end of the lifting cylinder, and the lifting cylinder is used to drive the mounting plate to move up and down. The mounting plate can abut against the top of the material barrel and seal the top opening of the material barrel. A telescopic tube is fixed on the mounting plate, and the telescopic tube passes through the mounting plate. The top end of the telescopic tube is connected to the bottom end of the material storage barrel.

[0011] By adopting the above technical solution, when the cover opening assembly moves the barrel cover out of the upper area of ​​the material barrel so that the material barrel is connected with the storage barrel, the lifting cylinder is started to drive the mounting plate to move downward. During this process, the telescopic tube is stretched until the mounting plate contacts the top of the material barrel, thereby sealing the top opening of the material barrel. At this time, the valve is opened to allow the material in the storage barrel to enter the material barrel from the bottom opening of the storage barrel along the telescopic tube. Dust will be generated in the process of the material falling. The mounting plate plays a shielding role, so that the dust is isolated in the material barrel, thereby making the working environment less susceptible to influence.

[0012] Optionally, a respirator is provided on the mounting plate, and the respirator passes through the mounting plate. When the mounting plate abuts against the top of the material barrel, the respirator is used to absorb the gas in the material barrel.

[0013] By adopting the above technical solution, when the mounting plate contacts the top of the material barrel, the respirator is activated and the air in the material barrel is emptied by the respirator. Since the gas has mass, although its mass is relatively small, this tiny mass may also cause significant errors in high-precision weighing. Exhausting the gas can eliminate this error, thereby improving the accuracy of weighing. At the same time, changes in gas temperature and pressure may cause fluctuations in weighing results. By exhausting the gas, this fluctuation can be reduced, making the weighing results more stable.

[0014] Optionally, a sponge is provided on the bottom wall of the mounting plate.

[0015] By adopting the above technical solution, when the lifting cylinder drives the mounting plate to move down to the top of the material barrel, the sponge plays a protective role, and the sponge abuts against the top of the material barrel to prevent the mounting plate from colliding with the top of the material barrel and being damaged, thereby extending the service life of the material barrel. At the same time, the sponge has a porous structure, and when the material in the storage barrel enters the material barrel from the bottom opening of the storage barrel through the telescopic tube, the sponge can absorb the dust generated by the material to prevent the working environment from being polluted.

[0016] Optionally, an extrusion mechanism is provided on the mounting plate, and the extrusion mechanism includes a driving assembly and an extrusion assembly, and both the driving assembly and the extrusion assembly are rotatably connected to the mounting plate, the driving assembly is connected to the extrusion assembly, and the rotation of the driving assembly is used to drive the extrusion assembly to rotate, so that the extrusion assembly extrudes the telescopic tube.

[0017] By adopting the above technical solution, when the storage barrel is connected to the material barrel and the material in the storage barrel is entering the material barrel through the telescopic tube, the driving assembly is started to drive the extrusion assembly to intermittently abut against the telescopic tube and squeeze the telescopic tube. The material in the telescopic tube is squeezed by continuously changing the volume of the telescopic tube, thereby avoiding material blockage at the telescopic tube and improving the smoothness of material discharge.

[0018] Optionally, the driving assembly includes a worm and a motor, the end of the worm is rotatably connected to a mounting plate, the motor is disposed on the mounting plate, the worm is fixed to an output end of the motor, and the motor is used to drive the worm to rotate.

[0019] By adopting the above technical solution, when the material in the storage barrel enters the material barrel through the telescopic tube, the motor is started to drive the worm to rotate, thereby driving the extrusion assembly to intermittently abut against the telescopic tube.

[0020] Optionally, the extrusion assembly includes two worm wheels and two cams, the two worm wheels are respectively located on both sides of the worm, the worm wheels are meshed with the worm, the two cams correspond to the worm wheels one by one, the cams are coaxially fixed on the worm wheels, and the tip of the cams can abut against the telescopic tube.

[0021] By adopting the above technical solution, when the worm rotates, the two worm wheels are driven to rotate, and the rotation directions of the two worm wheels are opposite, so that the two cams move towards or away from the telescopic tube at the same time, and the tip of the cam can intermittently abut against the telescopic tube, so that the shape of the telescopic tube is constantly changed, so as to achieve the effect of squeezing the material in the telescopic tube.

[0022] Optionally, a guardrail is provided on the work frame.

[0023] By adopting the above technical solution, the guardrail plays a protective role, so that the operator is not likely to fall when walking onto the work frame to replenish the materials in the storage barrel, and the safety is higher.

[0024] In summary, the present application includes at least the following beneficial effects: 1. When in use, place the material barrel on the weighing assembly. At this time, the material barrel is empty. Then move the lid opening assembly to the barrel cover and connect it to the barrel cover. Then, use the lid opening assembly to drive the barrel cover to separate from the material barrel, so that the top opening of the material barrel is open. At this time, reset the weighing assembly to zero. Then open the valve to allow the material in the storage barrel to automatically fall into the material barrel. During this process, observe the reading on the weighing assembly. When the weight of the material barrel reaches the set value, close the valve to stop the material discharge. Then use the lid opening assembly to drive the barrel cover to reset and block the top opening of the material barrel. During the whole process, the material barrel can be automatically opened and the material can be automatically added, thereby improving work efficiency. 2. When the mounting plate contacts the top of the material barrel, start the respirator and use it to exhaust the air in the material barrel. Since the gas has mass, although its mass is relatively small, this tiny mass may also cause significant errors in high-precision weighing. Exhausting the gas can eliminate this error, thereby improving the accuracy of weighing. At the same time, changes in gas temperature and pressure may cause fluctuations in weighing results. By exhausting the gas, this fluctuation can be reduced, making the weighing results more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an automatic cover opening dust-free automatic weighing device according to an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of the cover opening assembly and the mounting plate.

[0026] In the figure: 10, working frame; 11, guardrail; 20, weighing assembly; 30, material barrel; 31, barrel cover; 40, storage barrel; 41, valve; 42, telescopic tube; 50, lid opening assembly; 51, support rod; 52, rotating rod; 53, connecting piece; 531, connecting cylinder; 532, suction cup; 533, suction tube; 534, air release port; 535, true air port; 60, mounting frame; 70, lifting cylinder; 71, mounting plate; 711, respirator; 712, sponge; 80, extrusion mechanism; 81, driving assembly; 811, worm; 812, motor; 82, extrusion assembly; 821, worm gear; 822, cam. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 This application is described in further detail.

[0028] The present application embodiment discloses an automatic cover opening dust-free automatic weighing device. Figure 1 and Figure 2 The automatic opening dust-free automatic weighing device includes a working frame 10, a weighing assembly 20 is installed at the bottom of the working frame 10, and the weighing assembly 20 includes a scale for weighing and a support frame. The scale is installed at the bottom of the working frame 10, and the support frame is placed on the scale. Then a material barrel 30 to be measured is placed on the support frame, and the weight of the material barrel 30 can be obtained from the reading on the scale.

[0029] Reference Figure 1 and Figure 2 The top of the material barrel 30 is open, and a barrel cover 31 for sealing the opening of the material barrel 30 is provided at the opening of the material barrel 30. A storage barrel 40 is installed on the work frame 10. The storage barrel 40 is located directly above the material barrel 30, and the bottom opening of the storage barrel 40 is aligned with the top opening of the material barrel 30. A guardrail 11 is installed on the work frame 10, and the guardrail 11 surrounds the storage barrel 40, so that the operator is not easy to fall when walking onto the work frame 10 to replenish the material in the storage barrel 40, which is safer.

[0030] Reference Figure 1 and Figure 2 A valve 41 is provided at the bottom of the storage barrel 40, and the valve 41 can control the opening or closing of the bottom opening of the storage box. A cover opening assembly 50 is provided on the working frame 10, and the cover opening assembly 50 is connected to the barrel cover 31. The cover opening assembly 50 is used to control the opening or closing of the barrel cover 31 to realize the connection between the storage barrel 40 and the material barrel 30.

[0031] When in use, the material barrel 30 is placed on the weighing assembly 20. At this time, the material barrel 30 is empty. Then, the lid opening assembly 50 is moved to the barrel cover 31, and the lid opening assembly 50 is connected to the barrel cover 31. Then, the lid opening assembly 50 drives the barrel cover 31 to separate from the material barrel 30, so that the top opening of the material barrel 30 is in an open state. At this time, the weighing assembly 20 is reset to zero. Then, the valve 41 is opened to allow the material in the storage barrel 40 to automatically fall into the material barrel 30. During this process, the reading on the weighing assembly 20 is observed. When the weight of the material barrel 30 reaches the set value, the valve 41 is closed to stop the material discharge. Then, the lid opening assembly 50 is used to drive the barrel cover 31 to reset and block the top opening of the material barrel 30. During the whole process, the automatic opening of the material barrel 30 and the automatic addition of materials are realized, thereby improving work efficiency.

[0032] Reference Figure 1 and Figure 2 , wherein the cover opening assembly 50 includes a support rod 51, a rotating rod 52 and a connecting piece 53, the support rod 51 is vertically arranged, and the bottom end of the support rod 51 is fixed on the working frame 10, the rotating rod 52 is horizontally arranged, and one end of the rotating rod 52 is hinged on the support rod 51, and the rotating rod 52 can swing in the horizontal direction with the support rod 51 as the axis.

[0033] Reference Figure 1 and Figure 2 The connecting member 53 includes a connecting cylinder 531, a suction cup 532, a suction pipe 533, an air release port 534 and a true air port 535. The connecting cylinder 531 is arranged on the rotating rod 52. The output end of the connecting cylinder 531 is connected to the suction cup 532. The suction cup 532 abuts against the barrel cover 31. The suction pipe 533 is arranged on the rotating rod 52. One end of the suction pipe 533 is connected to the suction cup 532, and the other end is connected to the true air port 535. The air release port 534 is arranged on the suction pipe 533. The air release port 534 and the true air port 535 are both provided with air valves, and the opening and closing of the air release port 534 and the true air port 535 are realized by the air valves.

[0034] The rotating rod 52 is driven to rotate on the support rod 51 with the support rod 51 as the axis until the rotating rod 52 rotates to the barrel cover 31, and then the connecting cylinder 531 is started to drive the suction cup 532 to abut against the barrel cover 31, and then the air vent 534 is closed, and the true air port 535 is opened to draw a vacuum in the suction tube 533, so that the barrel cover 31 is sucked tightly on the suction cup 532, and then the connecting cylinder 531 is started again to drive the suction cup 532 to move upward, so that the barrel cover 31 is separated from the material barrel 30, and then the rotating rod 52 is driven to rotate, so that the barrel cover 31 is completely moved out of the upper area of ​​the material barrel 30, so that the bottom of the storage barrel 40 is connected with the top of the material barrel 30, so that the material barrel 30 receives the material in the storage barrel 40.

[0035] Reference Figure 1 and Figure 2 When the material in the material barrel 30 reaches the specified weight, first close the valve 41 on the storage barrel 40, then use the rotating rod 52 to reset the barrel cover 31, that is, the barrel cover 31 is aligned with the opening of the material barrel 30, and use the connecting cylinder 531 to make the barrel cover 31 contact with the material barrel 30 again and block the top opening of the material barrel 30, then close the true air port 535, open the air release port 534, so that the suction cup 532 is filled with gas and loses suction, and then remove the rotating rod 52 to achieve the connection between the barrel cover 31 and the material barrel 30.

[0036] Reference Figure 1 and Figure 2 When the material in the storage barrel 40 enters the material barrel 30, the material is prone to generate large dust during the unloading process. In order to ensure that the working environment is not polluted, a mounting frame 60 is fixed on the storage barrel 40, and a lifting cylinder 70 is installed on the mounting frame 60 by bolts. The output end of the lifting cylinder 70 is vertically downward and fixed with a mounting plate 71. The lifting cylinder 70 is used to drive the mounting plate 71 to move up and down. The mounting plate 71 can abut against the top of the material barrel 30 and cover the top opening of the material barrel 30. Reference Figure 1 and Figure 2 The bottom of the material storage barrel 40 is connected with a telescopic tube 42, one end of which is fixedly connected to the bottom of the material storage barrel 40. The other end is penetrated by a mounting plate 71 and fixed to the mounting plate 71. When the lid opening assembly 50 moves the barrel cover 31 out of the upper area of ​​the material barrel 30 so that the material barrel 30 is connected to the material storage barrel 40, the lifting cylinder 70 is started to drive the mounting plate 71 to move downward. During this process, the telescopic tube 42 is stretched until the mounting plate 71 contacts the top of the material barrel 30, thereby covering the top opening of the material barrel 30. At this time, the valve 41 is opened, so that the material in the material storage barrel 40 enters the material barrel 30 from the bottom opening of the material storage barrel 40 along the telescopic tube 42. During this process, under the action of the mounting plate 71 and the telescopic tube 42, the movement of the material is in a closed environment, so that the dust is isolated in the material barrel 30, so that the working environment is not easily affected.

[0037] Since the mounting plate 71 will abut against the top of the material barrel 30, in order to ensure the stability of the contact between the mounting plate 71 and the material barrel 30, a sponge 712 is provided on the bottom wall of the mounting plate 71. When the lifting cylinder 70 drives the mounting plate 71 to move down to the top of the material barrel 30, the sponge 712 plays a protective role. The sponge 712 abuts against the top of the material barrel 30 to prevent the mounting plate 71 from colliding with the top of the material barrel 30 and being damaged, thereby extending the service life of the material barrel 30. At the same time, the sponge 712 is a porous structure. When the material in the storage barrel 40 enters the material barrel 30 from the bottom opening of the storage barrel 40 through the telescopic tube 42, the sponge 712 can absorb the dust generated by the material to prevent the working environment from being polluted.

[0038] Reference Figure 1 and Figure 2 In order to ensure the accuracy of measuring the weight of the material barrel 30, a respirator 711 is installed on the mounting plate 71. The respirator 711 runs through the mounting plate 71. The respirator 711 here is a prior art and will not be described in detail here. When the mounting plate 71 contacts the top of the material barrel 30, the respirator 711 is started and the air in the material barrel 30 is emptied by the respirator 711. Since the gas has mass, although its mass is relatively small, this tiny mass may also cause significant errors in high-precision weighing. Exhausting the gas can eliminate this error, thereby improving the accuracy of weighing. At the same time, changes in the temperature and pressure of the gas may cause fluctuations in the weighing results. By exhausting the gas, this fluctuation can be reduced, making the weighing results more stable.

[0039] Reference Figure 1 and Figure 2 In order to prevent the material from being blocked when moving in the telescopic tube 42, an extrusion mechanism 80 is provided on the mounting plate 71. The extrusion mechanism 80 includes a driving assembly 81 and an extrusion assembly 82. The driving assembly 81 includes a worm 811 and a motor 812. The end of the worm 811 is rotatably connected to the mounting plate 71. The motor 812 is provided on the mounting plate 71. The worm 811 is fixed to the output end of the motor 812. The motor 812 is used to drive the worm 811 to rotate.

[0040] Reference Figure 1 and Figure 2 The extrusion assembly 82 includes two worm wheels 821 and two cams 822. The two worm wheels 821 are respectively located on both sides of the worm 811. The worm wheels 821 are meshed with the worm 811. The two cams 822 correspond to the worm wheels 821 one by one. The cams 822 are coaxially fixed on the worm wheels 821. The tip of the cams 822 can abut against the telescopic tube 42.

[0041] When the material in the storage barrel 40 enters the material barrel 30 through the telescopic tube 42, the motor 812 is started to drive the worm 811 to rotate, driving the two worm wheels 821 to rotate, and the two worm wheels 821 rotate in opposite directions, so that the two cams 822 move towards or away from the telescopic tube 42 at the same time, and the tip of the cam 822 can intermittently abut against the telescopic tube 42, so that the shape of the telescopic tube 42 is constantly changed, so as to achieve the effect of squeezing the material in the telescopic tube 42, avoid the material from being blocked at the telescopic tube 42, and improve the smoothness of material discharge.

[0042] The implementation principle of the automatic opening dust-free automatic weighing device of the embodiment of the present application is as follows: when in use, the material barrel 30 is placed on the weighing assembly 20, and the material barrel 30 is empty at this time. Then the opening assembly 50 is moved to the barrel cover 31, and the opening assembly 50 is connected to the barrel cover 31. Then the opening assembly 50 drives the barrel cover 31 to separate from the material barrel 30, so that the top opening of the material barrel 30 is in an open state. At this time, the weighing assembly 20 is reset to zero for preparation. Then the valve 41 is opened to allow the material in the storage barrel 40 to automatically fall into the material barrel 30. During this process, the reading on the weighing assembly 20 is observed. When the weight of the material barrel 30 reaches the set value, the valve 41 is closed to stop the material discharge. Then the opening assembly 50 is used to drive the barrel cover 31 to reset and block the top opening of the material barrel 30. In the whole process, the automatic opening of the material barrel 30 and the automatic addition of materials are realized, thereby improving work efficiency.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Automatic opening dust-free automatic weighing device, characterized in that: The invention comprises a working frame (10), wherein a weighing assembly (20) is provided on the working frame (10), a material barrel (30) is placed on the weighing assembly (20), the weighing assembly (20) is used to measure the weight of the material barrel (30), the top of the material barrel (30) is open, and a barrel cover (31) is provided at the opening of the material barrel (30) for sealing the opening of the material barrel (30), and a material storage barrel (40) is provided on the working frame (10), and the material storage barrel (40) is located at the material barrel (30). The bottom opening of the material storage barrel (40) is directly above the material storage barrel (40), and the bottom opening of the material storage barrel (40) is aligned with the top opening of the material barrel (30). The bottom of the material storage barrel (40) is provided with a valve (41) for controlling the opening or closing of the bottom opening of the material storage box. The working frame (10) is provided with an opening cover assembly (50), and the opening cover assembly (50) is connected to the barrel cover (31). The opening cover assembly (50) is used to drive the barrel cover (31) to move in a direction close to or away from the material barrel (30).

2. The automatic cover opening dust-free automatic weighing device according to claim 1 is characterized in that: The lid opening assembly (50) comprises a support rod (51), a rotating rod (52) and a connecting piece (53); the support rod (51) is arranged vertically, and the bottom end of the support rod (51) is fixed on the working frame (10); the rotating rod (52) is arranged horizontally, and one end of the rotating rod (52) is hinged on the support rod (51); the connecting piece (53) is arranged on the rotating rod (52), and the connecting piece (53) is connected to the barrel cover (31).

3. The automatic cover opening dust-free automatic weighing device according to claim 2 is characterized in that: The connecting member (53) comprises a connecting cylinder (531), a suction cup (532), a suction pipe (533), an air release port (534) and an air inlet (535); the connecting cylinder (531) is arranged on the rotating rod (52); the output end of the connecting cylinder (531) is connected to the suction cup (532); the suction cup (532) abuts against the barrel cover (31); the suction pipe (533) is arranged on the rotating rod (52); one end of the suction pipe (533) is communicated with the suction cup (532); the other end is communicated with the air inlet (535); and the air release port (534) is arranged on the suction pipe (533).

4. The automatic cover opening dust-free automatic weighing device according to claim 1, characterized in that: The material storage barrel (40) is provided with a mounting frame (60), and the mounting frame (60) is provided with a lifting cylinder (70). A mounting plate (71) is fixed to the output end of the lifting cylinder (70), and the lifting cylinder (70) is used to drive the mounting plate (71) to move up and down. The mounting plate (71) can abut against the top of the material barrel (30) and cover the top opening of the material barrel (30). A telescopic tube (42) is fixed to the mounting plate (71), and the telescopic tube (42) passes through the mounting plate (71). The top end of the telescopic tube (42) is connected to the bottom end of the material storage barrel (40).

5. The automatic cover opening dust-free automatic weighing device according to claim 4 is characterized in that: A respirator (711) is provided on the mounting plate (71), and the respirator (711) passes through the mounting plate (71). When the mounting plate (71) abuts against the top of the material barrel (30), the respirator (711) is used to absorb the gas in the material barrel (30).

6. The automatic cover opening dust-free automatic weighing device according to claim 4, characterized in that: A sponge (712) is provided on the bottom wall of the mounting plate (71).

7. The automatic cover opening dust-free automatic weighing device according to claim 4, characterized in that: The mounting plate (71) is provided with an extrusion mechanism (80), the extrusion mechanism (80) comprising a driving assembly (81) and an extrusion assembly (82), the driving assembly (81) and the extrusion assembly (82) both being rotatably connected to the mounting plate (71), the driving assembly (81) being connected to the extrusion assembly (82), the driving assembly (81) rotating to drive the extrusion assembly (82) to rotate, so that the extrusion assembly (82) extrudes the telescopic tube (42).

8. The automatic cover opening dust-free automatic weighing device according to claim 7, characterized in that: The driving assembly (81) comprises a worm (811) and a motor (812); the end of the worm (811) is rotatably connected to a mounting plate (71); the motor (812) is disposed on the mounting plate (71); the worm (811) is fixed to an output end of the motor (812); and the motor (812) is used to drive the worm (811) to rotate.

9. The automatic cover opening dust-free automatic weighing device according to claim 8, characterized in that: The extrusion assembly (82) comprises two worm wheels (821) and two cams (822). The two worm wheels (821) are respectively located on both sides of the worm (811). The worm wheels (821) are meshed with the worm (811). The two cams (822) correspond to the worm wheels (821) one by one. The cams (822) are coaxially fixed on the worm wheels (821). The tips of the cams (822) can abut against the telescopic tube (42).

10. The automatic cover opening dust-free automatic weighing device according to claim 1, characterized in that: The working frame (10) is provided with a guardrail (11), and the guardrail (11) is arranged around the material storage barrel (40).

Images